Improvement in machines for making metal screws



5 Sheets-Sheet l.

. L. W. STOGKWELL- Machine for Making Metal-Screws am. MM

N-PETERS. FNOTO-UTHOGRAPHER, WASHINGTON. D. c.

5 Shets-Sheet 2.- L.'W. STOOKWELL. Machine for Maki ng Metal-Screws. No. 210,165. Patnied-Navyie,187s.

. STOOKW-ELL'. Machine for MakingMe-tal-Sorews.

No. 210,1 5. Patented Nov. 19, 1 78.

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Hill IIIIIIIFITA G%\%M W W llll N-FETERS. PHOKO-UYHOGRAPNER. WA

I 5 Sheets-Sheet 4.- L'.- W. S-TOOKWELL'. Machine for Making. Metal-Screws.

No 210,165. Patented Nqv. 19., 18%8.

N. PETERS. PHUl'D-LITHDGRAFHER, WASHINGTON U C.

shaft 0 is which is firmly attached to the frame 1).

UNITED, STATES PATENT Orr-Ten.

LEVI W. STOOKWELL, OF RAV MENTS, To v FREDERICK .w. WOODBRIDGE.

IMPROVEMENT 'IN MACHINES FOR ENNA, OHIO, ASSIGNOR, BY MESNE ASSIGN- J OHN C. GRANNIS, TRUSTEE FOR BRADFORD HOWLAND AND MAKING METAL SCREWS.

Specification fomiing part of Letters Patent No. 210,165, dated November 19, 1878 application filed April 28, 1877. I

To all whom it may concern:

Be it known that I, LEVI W. STOCKW'ELL, of Ravenna, Portage county, Ohio, have invented a new and useful Improvement in Machines for Making Machine-Screws, which improvement is fully set forth in the following specification,reference being had to the accompan yin g drawings.

The object of my invention is to mill, thread cut off, and finishthe heads and points of the screws by holding the rods from which the screws are made in a series of chucks, which are moved by a chuck-carrier from one toolholder to anotheruntil the rod has been operated upon by a series of tools, all the tools opera-tin g simultaneously upon different rods.

Figure 1 is afront elevation. Fig.2 is a vertical section. Fig. 3 is a plan view of the machine. Figs. 4 to 14, inclusive, represent various detached parts.

The greater partof the frame 11 is circular, its top being in the form of aring. The main connected with the perpendicular shaft (1 by the bevel-wheels g and a The shaft (1 turns in the fixed hollowcylindenl jn he wheel d on the shaft d connects with wheels d d d d on the hollow spindles d d d d of the chucks a a a -a- The wheels d are loose on the spindles (14, but turn them and the chucks a by means of 'the clutches a? a a a, which slide onthespindles. The chuck-spindles (1* turn in a chuck carrier, (o formed of two circular plates, one above the other, and both firmly attached to a third part, a, which is a hollow shaft surrounding the cylinder m and supported by the frame 1). Between the circular plates of the chuck-carrier a are the wheels (1 d d (1 attached to the chuck-spindles d. The wheels 01 are alternately in connection with the wheel 9 on the shaft 9 at each quarter-revolution of the carrier o the motion of which is intermittent. When wheel (1 is in con nection with wheel the lever 0, attached to the clutch a, is raised by the cam' g,'thereby throwing wheel d out of clutch, so that it turns loose on the spindle d. The cam g is attached to the frame I), and lifts the lever 0 when the chuck-carrier a is turning,

turned forward, moves notches 'in the and just before the wheel (1 connects with the wheel 9 Each of the levers c c c c is connected by a pin with an'annular groovein the clutch a. v

' The intermittent motion ofthe chuck-carrier a is produced by the following means:

The ring 0 rests in a recess or depression in the carrier a Its circumference (onefonrth of which is toothed) is somewhat greater than that of the carrier. Its toothed partoonnects with the wheel 0 on the shaft 9. The wheel 0 rotates alternately in opposite directions, and thereby gives an intermittingly rotary motion alternately in opposite directions .to the ring 0. A slip-tooth, s, at each end of the toothed part of theringe, enables the wheel 0', whenever its motion is reversed, to connect with the teeth on the ring 6. At-

tached to'the'bottom of the ring 6 at its circumference, is a spring-pawl, m Fig. 3, which enters alternately four notches,-equally distant from each other, in the circumference of the carrier a and thereby, when the ring 0 is the carrier c a quarter of a revolution. There are four other notches in the circumference of the carrier a equally distantfrom each other, into which,

alternately, the .stop nh'Fig. 3, enters when.

the carrier 0? has made a quarter-revolution. The stop a firmlyholds the carrier (6 in its position while the rods in the chucks a, a a. a. are being operated'oucby the tools. The stop a slides in the box 1*, attached to the top 'of the frame I), and is forced into'the carrier to by the spring stattached to'the circumference of the frame I).

When the carrier isin the position as shown in Fig. 3, and'the tools are operating on the rods held in the chucks, the motion of the wheel 0 is reversed, which turns the ring 0 backward on the carriera carrying the pawl m out of the notch in the carrier o The ring 0 also carries with it the cam 6 which is held in position on the top of the ring 6 by the pins 92 and a While the ring c is thus making its backward movement on the carrier a, which is still being held by the stop a, the cam c is lifted, as shown lll Fig. 4, by a. pin projecting lnpwa'rd from the stop a, and

forming a part of it, and passes over the stop a without forcing it out of the notch in the carrier a When the backward movement of the ring 0 is completed, its position, with its pawl m and cam 0 in reference to the stop a and the notches in the carrier a, is as shown in Fig. 6.

hile it is again moving forward until the pawl m enters the notch in the carrier (0 Fig. 7, the cam e forces the stop it out of its notch in the carrier a and then the ring 0 turns forward the carrier a a quarter of a revolution, till the stop a is again forced into its notch in the carrier a by the spring 8 as shown in Fig. 3. The ring 0 moves enough more than a quarter of a revolution to permit the cam i to force the stop u out of its notch in the'carrier a before the pawl m enters its notch to move forward the carrier.

The tools are operated as follows: The toolholders is k carry tools for cutting off the rod heldin the chuck a and shaping the head of the screw-bolt. They have a horizontal reciprocating motion, approaching and receding from each other. The tool-holders k' k lc have aperpendicularly reciprocating motion. The tools to be used in holder k mill the rod, those in k point it, and the dies in k thread it,'and then it is cut off from the rod and its head shaped by the cutters in the holders k k. The lower part of each tool-holder]; k fk 'is a spindle having a vertical motion in the frame I).

To the lower end of the spindle of theholder k is attached the lever i, the outer end of which turns on a pin in a PIOJBGUIlg' part of the frame b, and the inner end connects with the worm h". This worm is turnedon the 1101- low cylinder m by means of its teeth 0, surrounding it at its lower end, and connecting with the wheel e on the shaft h The shaft It turns in the frame b, and has on it the loose wheels 2' and W, with the slidingcluteh i between them, which connects alternately with each of the wheels. The wheel z' is turned loose on its shaft by the wheel at on the shaft (1 except when wheel 2' is connected with clutch z, and then it turns its shaft 713, wheel 6 and worm h. The worm-wheel 7L connects with the worm m Fig. 5, on the main shaft, and turns the shaft h and worm h, when it connects with the clutch 2', as shown in Fig. 1. It turns the worm h so as to raise the toolholders k k by means of the levers i and i, while the tools are operating on the rods held in the chucks to, except while finishing the operation. The levers i i reston the horizontal top of the worm h, causii-igthe tools to remain stationary while finishing their work. The

.iorizontal top of the thread of the worm is :hown in Fig. 2, and by the dotted line in Fig. l. When this is accomplished the clutch t :onnects with the wheel 2', which rapidly re- 'erses the motion of the worm k lowering the evers i z" and the tool-holders 10 k and thus vithdraws the tools from the rods. The lever connects with the worm h, and also with a am, k, which moves the tool-holders k k by the contact of the sides of the cam-grooves 0 0 with a pin in the side of each holder, as shown in Fig. 8. \Vhen the lever '0' is raised by the worm h the cam k forces the holders k 70 toward each other to cut off the rod held in chuck a and shape the screw-head, and causes them to recede when the lever t is lowered by the worm h. The tool-holders k k are held and slide in the frame Z).

The cam-groove 0, which operates the beveling-tool for shaping the screw-head, and the ca-n1-groove 0 which operates the cutting-off tool, converge downward; but only a part of cam-groove o converges, the remainder being vertical, and causing the beveling-tool to remain stationary while finishing the shaping of the screw-head.

A part of cam is, Fig. 8, is represented as a section, so as to show the cam-grooves o o. A cross-section of one side of the cam k and the tool-holder k and connecting parts is shown in Fig. 9.

The tool-holder is, Fig. 2, which carries the threading-dies, is raised and lowered by means of the nut l on the screw m, one side of the nut being firmly attached to the spindle of the holder W. The screw m is held .in the hub of the wheel 2', which connects with wheel Z. The ratio of the diameters of wheels g and (Z is the same as that of wheels I and l'.

As the thread to be cut on the rod held in the chuck a will correspond with the thread of the screw m, the screw and the nut l are made removable, so that a nut and screw of any desirable thread may be substituted in their places.

The wheel 1 has an intermittent rotation in opposite directions, which is more rapid when lowering the tool-holder k to withdraw the threading-dies from the rod. This motion is produced by means of the clutch e on the shat t 9 The clutchc slides on its nects alternately with the loose wheclsh and g, which connect with wheels I) and b onthe main shaft 0".

When theclutch e connects with wheel h, the wheel 0 on the shaft moves forward the chuck-carrier a a quarter of a revolution, in time to bring the chucks a in position for the rods to beoperated-on before the approaching threadin g-dies in the rising tool-holder k reach the rod, and then the threading-dies continue to rise and thread the rod. While the ring 0 is being moved forward, carryingthe chucks a into position over the tools, as before stated, one of the levers c is raised by the cam g, disconnecting the clutch a from the wheel d, before the wheel d connects with wheel 9, so that while the threading'dies are operating the chuck above them is revolved by the shaft g instead of by the shaft d.

When the clutch c connects with wheel 1 which is smaller than wheel It, the motion of wheel I is reversed and accelerated and the threading-dies rapidly withdrawn from the rod heldin chuck a, while the wheel 9 reverses the motion of the connecting-wheel d and the shaft, and con chuck. At the same timethe ring 6 is moved backward on the carriera by the reversed motion of wheel 0 i When the threadi'n g-dies have finished their work and withdrawn from the screw-bolt, the other tools have not ceased operating, and therefore when the clutch eis disconnectedfrom wheel 1 and before connectin g with wheel h, it is caused to remain suspended between the two wheels h and g, thereby stopping the motion of shaft untilthe milling, pointing, and cutting-off tools have'finished their work.- The cause of thissuspension of clutch 0 will be hereinafter explained.

The wheel 9 with the upper part of its shaft is permitted to have a slight lateral or oscillatin g movement, toxaid the wheels d. and g in making connection with each other, when the carrier at? is moving. forward. This is done by means of the box 8, in whichthe shaft turns, Figs. 2' and 6, which has space in the frame b to move outward .against the spring 8, attached to theframe, whenever the ends of the teeth in wheels (1 and 9 come in contact at the moment the wheels connect with each other.

There is an annular groove in the upper part of. the'chucks a a a a, into which pins in the levers s s s 8 enter, for the purpose of opening the jaws of the chucks to release the rods by raising the levers. The inner ends of the levers s are attached to the carrier a and the outer ends are raised alternately by the cam x, as shown in Fig. 12. The cam 50 is attached in such a position on the frame I) asto lift the lever s after the screw-bolt has been cut oif from the rod, and while the chuck is moving from the tool-holder k k to the next tool-holders, W. I V

7 he cam w is attached tovthe frame b with the cam av, so that when the lever s has been raised by the upwardly-inclined cam a? and the chuck-j aws 2 2 opened, it comes in contact with the under side of the downwardlyeinclined earn 00, which forces the lever. 8 down and closes the chuck-jaws 2 2 firmly against .the rod. While the chuck-jaws 2 2 are open the the rod 1 drops on a gage, s, which is adjustable for any desired length of screw-bolt. The horizontal gage s is a thin broad piece of metal, having its shank bent upward, so as to be attached to the upright part of the frame I) by a screw through a slot in, the frame, by which it is adjusted for the different lengths of screw-bolts to be made by the machine.

The clutch .1, Figs. 1 and 5, is operated by the lever m, which turns on a pin in the frame I), and is connected at its innerv end with an annular groove in the clutch t, and at its outer end is narrowed to nearly a horizontal edge, where it connects with the cam-spring 1) attached to the frame b. Near its outer end the lever m? is connected by a .pin with the upright rod 12,-thy which it, is operated. The.

rod 11 passes through the outer end of .the lever t, which is moved up and down on the rod p by the worm h. On each side of the lever i and surrounding the rod is a spiral spring, a it, held by adjustable collars .00 on the rod against the pressure of the lever on the springs. v The adjustable stops p p are attached to the collars, and the lever 47, after compressing the spiral spring aflpresses against an end of each stop alternately, and thus raises or lowers the rod'p and moves the outer end of lever m against the V-shaped cam 21 on the cam-spring p and thereby connects the clutch z with one of the wheels 2'. k The pressure of the cam-spring 10 prevents the outer end of levcrm 'from moving over the cam Q2 until, by the movement of lever 6 the pressure against one of the stops 11* moves the outer end of lever m to the apex of cam '0, and then the action of one of the spiral springs a a, moves the lever m over the other part of the cam v, and thereby connects the clutch i with one of the wheels i h.

The clutch 0, Fig. 10, is operated by the leverh ,-the inner end of which connects with an annular groove in the clutch. The lever h turns on a pin in the frame I), between which and the clutch it is connected by a pin with an upright rod, 0 above it. The lever 70 is moved by this rod, which connects with'the lever 1 and a nut, a, on a threaded part of the shaft 9 between the wheels Z h. The lever l is connected by a pin withthe nut a, and one end turns on a pin in the frame of the machine, and the other end is connected by a pin with the sliding "collar v on the rod '0 between two adjustable collars, 00 00 The shaft 9, by its intermittent motion in opposite directions, moves the nut n alternately up and down on the'thread of the shaft, and thereby moves the lever 1 till the sliding collar o by compressing the spring a, operates the lever h, so as to connect clutch 6 with wheel 1 and by a reverse motion of nut n lifts the rod 0 and lever h, so as to disconnect clutch c from wheel 9 and hold the'clutch suspended between and disconnected from both the wheels h and. gi The outer end of the lever It connects with the cam-spring it, having a V-shaped cam, constructed and operating in the same manner as the cam-spring p and cam o, hereinbefore described. When the clutch e is disconnected from both the wheels h and g", the outer end of the lever h is against the apex of the cam.

spring t, and all the tools except the thread ing-dies continue to operate until the clutch i, Fig. 1, connects with wheel i, which causes theouter end of lever 11 to rise and lift one end of lever 10 Fig-{11, and the rod 1), thereby forcing down the'stop a and the outer arm of lever h Fig. 10, thus connecting the clutch e with Wheel h, and also lifting the outerarm of lever m*, Fig. 1, and thereby connecting the clutch i with wheel W. The lever p Fig. 11, turns on a pin in the frame I), the adjustable stop-ac being attached to one end, and the other end-projecting over the lever 6 The construction of the chucks a is shown in Figs. 12, 13, and 14. In the vertical section,

Fig. 12, the lever s is represented by dotted rier c to the position shown in Fig. 6. The lines as having been raised by the cam 00, so nut 12 and lever 1 rise and lift the rod 11 and as to open the jaws 2 2 and permit the rod 1 lever h, Fig. 10, disconnecting the clutch e to drop on the gage s. The sliding collar 6, from the wheel 9, and holdingit disconnected around the spindle d", is slotted, as well as the from both wheels h and g. spindle, to receive the jaws 2 2 and seats 4 4. All the tools exceptthe threading-dies cou- The outer ends of the jaws converge upward, tinue to operate, and when their work on the each being fitted into a recess in the seats 44, rods is finished the lever 6 by contact with having the same convergence. The flange 8 stop 19, forces down the outerend of lever in on the top of the seat enters an eccentric and'connects the clutchz' with wheel '5', reversgroove in the scroll 3, the outer wall of the ing the motion of worm h, and lowering the groove projecting downward in contact with three levers and tool-holders connected with the outer end of the seat 4, to support the outthem till the outerrend'of lever '6 lifts the end ward pressure of the jaws and seats. The of lever 12, Fig. 1, and the stop p thereby scroll 3 and seats 4 4 are retained in the slidshifting the clutchi to the wheel h and shifting collar 6 by the face-plate 5, which is bolted ing the suspended clutch c to the wheel h by to the collar. The jaws 22are retained in the pressing the stop 00*, Fig. 11, down on the spindle d by flanges 011 each side of them at outer end'of lever h, Fig. 10. This last shift their top, which rest in grooves in the spiiidle. ing of the clutches e and 2' causes all the tools A groove, 8'', is cut across each flange of the to again approach the rods in the chucks, jaw 2, near its outer end. The seat4 isslotted while the wheel 0 turns' forward the ring a and grooved parallel with the outer end of the and carrier c with its chucks a, into their jaw 2, to fit the grooves and flange of the jaw. position, asshown in Figs. 1, 2, and 3. While When the sliding collar 6, with the seats 4 4, the chuck-carrier a is being thus moved forare raised on the spindle d by the lever 8 the ward the wheel 61 is disconnected from the parts of the seats 4 4 which enter the grooves wheel 9, the lever 0 leaves the cam g, Fig. 2, s s in the jaws 2 2 force open the jaws, and and permits the clutch a to again connect when the sliding collars 6 and the seats 4 4 withand turn the wheel (1 and the chuck. are forced downward by the lever 8 the con- The lever s is raised by the cam 00, and forced vergent slots in the seats close the jaws 2 2 down by the cam 4r, opening and closing the firmly against the rod 1. The jaws 2 2 are jaws of the chuck, and permitting the rod to adjusted to hold different sizes of rods by drop 011 the gagesfl so as to be in position to turning the scroll 3 in the sliding collar 6, the be again operated on by the milling-tools. seats 4 4 being moved toward and from the I claim as my invention chuck center by means of the flange S in the 1. In a screw-cutting. machine, a series of eccentric grooves of the scroll. rotating and revolving roddlolders, in combi- The entire machine is operated as follows: nation with a series of tools adapted to oper- The rods being manufactured into screw-bolts ate simultaneously and successively upon two are held perpendicularly in the hollow spindles or more rods to perform the operations of mill- (1 by the jaws 2 2 of the chucks a. In Figs. ing, threading, and pointingthe rods, or either 1, 2, and 3 the various parts of the machine two of such operations, substantially as deare shown in the position they occupy when scribed. theclutchehas been connectedwith wheel hlong 2. The combination, with a rotating rod-carenough tomove forward thecarriera By turnrier and a series of rotating rod-holders supin the crank b of the main shaft 0 the worm ported by the carrier, of a tool to cut a screwm and worm-wheel h slowly turn the worm thread upon one rod, anda cutting-oil tool to h, lifting the levers i i i The shaft d re cut oil a screw already formed and located at volves three of the chucks a, and the shaft 9 the end of another rod, both tools operating revolves the other chuck, the wheel d turning simultaneously and'successivel y, substantially loose on its spindle when the cam g raises the as described. lever 0 The tool-holders 7c is converge, cut 3. The combination, with a rotatinghead ofi', and finish the screw-bolt, which has al provided with a series of rotating rod-holders, ready been milled, pointed, and threaded by of a tool to turn down the circumference of the other tools. The milling-tools in holder k one rod, a tool to cut a screw-thread upon mill the rod in the chuck above it. The tools another rod, and a cuttingofi' tool to sever a in holder k point the screw-bolt. The wheels threaded screw from another rod, all adapted l l', screw 'm, and nut I raise the die-holder k, to operate simultaneously and successively, and thread the screw-bolt. The outer end of substantially as describec lever l and the nut n, Fig. 10, move down- 4. The ring 0', having a toothed segment, ward, and when the operation of the threadwithaslip-tooth, s, at each 1 end of the seg ing-dies is finished, the nut a, lever Z rod 12 ment, and its pawl m, in combination with and lever h, connect the clutch c with wheel the carrier at and wheel 0 substantially as reversing the motion of the chuck above described. the threading-dies, which now withdraw from 5. The carrier (o in combination with the the threaded screw-bolt by the wheels land 0, ringe', pawl m, cam 0 and stop a, substanrcvcrsin g the motion of the screw m, Fig. 2. tially as described. The wheel 0 turns back the ring 6 on the car- 6. The carriera in combination with spina dle 01, wheels 01 d clutch a, lever c, and cam substantially as described.

7. The combination. of the shaft 01, 'wheels 61 d d g, shaft 9 spindle d, and clutch (0 substantially as described.

8. The combination of the carrier a ring 6 pawl m spindle (1*, wheels 01 g 0 shaft 9 and sliding box 3, substantially as described.

9. The combination of a series of vertical rod-holders with a series of tools beneath the rods, in such manner that each tool may operate on each rod by bringing them successively in vertical line with each other to perform different steps in the formation of screws, and so that the weight of each rod, when released in its holder, will cause it to approach the tool beneath it, substantially as described.

10. In combination with the chuck for revolving the'reduced and threaded rod, the chamfering cutter, adapted to chamfer the head-of the screw while the same is being severed from the rod -bythe cutting-0E tool, substantially as described. I

11. The combination of'the worm k with the wheels 0 i a, worm m worm-wheel W, and clutch z, substantially as described.

12. The combination of the worm 70. clutchz', levers i and m, and the rod p with stops p pflspringsn m, and the cam-spring 19, substantially as described.

13. The combination of lever p with clutch 0, wheels h and g threaded shaft 9 nut a, lever l rod 0 spring 12 collar mi -lever h, and cam-spring t, substantially as described.

14. The *combination of worm k with the tool-holders and levers i p 71 cam-spring t, clutch 0, wheel h, shaft g wheels g 01 spindle d, and chuck a, substantially as described.

15. The shaft '9 in combination withthe wheels 1 l screw m, nut 1 holder k wheels g 0?, and spindle at, substantially as described.

16. The gage s, in combination with the chuck a lever 8 and cam w, substantially as described.

17 The sliding collar 6and scroll-ring 3, in combination with the jaws 2 2,having convergent outer ends, and the seats 4 4, having convergent'slots'and grooves for the jaws to fit into, substantiallyas described.

GEORGE 13. ROBINSON, BRADFORD HOWLAND. 

